An embedded part and its usage method

Abstract

The present invention provides a pre-embedded part, which includes an inner anchoring section, a fixed connection section and an outer anchoring section connected in sequence; the inner anchoring section is embedded in the steel reinforcement cage, the projection of the inner anchoring section in the axial direction of the steel reinforcement cage extends along the circumferential direction of the steel reinforcement cage, and the inner anchoring section is connected to the inner wall of the steel reinforcement cage; the fixed connection section penetrates the side wall of the steel reinforcement cage; the outer anchoring section is attached to the outer wall of the steel reinforcement cage. The present invention also provides a method for using the above-mentioned pre-embedded part, which includes the following steps: embedding the inner anchoring section in the steel reinforcement cage and fixing it along the circumferential direction of the steel reinforcement cage on the inner side surface of the steel reinforcement cage; putting the steel reinforcement cage installed with the pre-embedded part into the pile hole and pouring concrete to form a pile foundation; when the foundation pit is dug to the height of the ring beam, breaking the pile foundation concrete to fully expose the outer anchoring section; straightening the outer anchoring section to a horizontal state. By installing the ring beam in the pile foundation by means of the pre-embedded part, the present invention has reliable fixation, high construction efficiency and can greatly save costs.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and more specifically, to an embedded part and a method for using the same. Background Art

[0002] Urban development is greatly restricted by land factors. Therefore, the application of underground space has become an important part of current urban construction. The most typical application of underground space is the construction of underground rail transit. During the excavation of subway tracks, vertical shafts need to be excavated along the track. The supporting structure form of the vertical shaft is mostly a structure of row piles plus a capping beam 3 plus a ring beam 2, and its structure is as Figure 1 shown. In order to facilitate the construction of the ring beam 2 on the pile foundation 1, during the excavation of the vertical shaft, when reaching the designed height of the ring beam 2, the excavation is stopped, and the side of the pile foundation 1 close to the ring beam 2 is chiseled open, so that the steel reinforcement cage 11 of the pile foundation 1 is exposed, and then a connecting component is welded on the steel reinforcement cage 11 for fixing the ring beam 2.

[0003] In the prior art, as Figure 2 shown, the steel reinforcement cage 11 at least includes main steel bars 111, stirrups 112 and internal reinforcement bars 113. When constructing the ring beam 2 according to the foregoing method, first, the connection points between the ring beam 2 and the steel reinforcement cage 11 of the pile foundation 1 are concentrated on several main steel bars 111 on the side of the steel reinforcement cage 11 close to the ring beam 2, that is, the connection strength between the ring beam 2 and the pile foundation 1 depends on these several main steel bars 111. Therefore, the pile foundation 1 is unevenly stressed as a whole; secondly, in order to ensure the installation quantity of the connecting component, a large amount of the pile foundation 1 needs to be chiseled open. On the one hand, it affects the strength of the pile foundation 1, and on the other hand, it increases the workload of the staff; finally, the concrete is adhered to the chiseled steel reinforcement cage 11 in the later stage, which affects the welding strength of the connecting component.

[0004] In the prior art, there is also a method of embedding connecting pieces in the pile foundation. After the embedded parts are exposed by breaking the pile foundation concrete in the later stage, they are fixedly connected with the ring beam. However, due to the design of the embedded parts, when fixing the embedded parts to the steel reinforcement cage, it is easy to interfere with the structure of the steel reinforcement cage itself, mainly reflected in the interference with the internal reinforcement bars of the steel reinforcement cage, resulting in great difficulty in welding the embedded parts to the steel reinforcement cage, affecting the pouring of concrete in the steel reinforcement cage, and the connection points between the traditional embedded parts and the steel reinforcement cage are mostly concentrated on the side of the ring beam, making the steel reinforcement cage unevenly stressed and poor in safety.

[0005] In view of this, the present application is specifically proposed. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the first object of the present invention is to provide an embedded part, which has a reasonable structure, is convenient for cooperating and connecting with the steel reinforcement cage, and is convenient for reliably connecting the steel reinforcement cage and the ring beam into an organic whole.

[0007] The second object of the present invention is to provide a method for using a pre-embedded part, which is used for connecting a steel reinforcement cage and a ring frame beam by setting the pre-embedded part, with high efficiency, high strength and low cost.

[0008] The embodiments of the present invention are realized through the following technical solutions:

[0009] A pre-embedded part includes an inner anchoring section, a fixed connection section and an outer anchoring section which are connected in sequence; the inner anchoring section is embedded in the steel reinforcement cage, the projection of the inner anchoring section in the axial direction of the steel reinforcement cage extends along the circumferential direction of the steel reinforcement cage, and the inner anchoring section is connected with the inner wall of the steel reinforcement cage; the fixed connection section penetrates through the side wall of the steel reinforcement cage; the outer anchoring section is attached to the outer wall of the steel reinforcement cage.

[0010] According to a preferred embodiment, the steel reinforcement cage is cylindrical, and the outer shape of the inner anchoring section is in an arc shape extending along the circumferential direction of the steel reinforcement cage.

[0011] According to a preferred embodiment, the arc is concentric with the steel reinforcement cage.

[0012] According to a preferred embodiment, the outer anchoring section is attached to the outer wall of the steel reinforcement cage in a manner of extending along the axial direction of the steel reinforcement cage.

[0013] A method for using a pre-embedded part includes the following steps:

[0014] S1. Installation of the pre-embedded part: embed the inner anchoring section in the steel reinforcement cage and fix it along the circumferential direction of the steel reinforcement cage on the inner side surface of the steel reinforcement cage;

[0015] S2. Burying of the pre-embedded part: put the steel reinforcement cage installed with the pre-embedded part into the pile hole and carry out concrete pouring to form a pile foundation;

[0016] S3. Chiseling out of the pre-embedded part: when the foundation pit is dug to the height of the ring frame beam, break the pile foundation concrete so that the outer anchoring section is fully exposed;

[0017] S4. Straightening of the pre-embedded part: straighten the outer anchoring section to a horizontal state.

[0018] According to a preferred embodiment, S1 includes the following steps:

[0019] A1. Mark the installation center point of the pre-embedded part on the outer wall of the steel reinforcement cage according to the design position of the ring frame beam;

[0020] A2. With the center point as the center on the outer wall of the steel reinforcement cage, delimit the installation area of the pre-embedded part within no more than 45° to the left and right around the central axis of the steel reinforcement cage;

[0021] A3. Install a plurality of the embedded parts on the steel reinforcement cage such that the outer anchoring section of the embedded part is within the installation area and is in contact with the outer wall of the steel reinforcement cage;

[0022] A4. Connect the inner anchoring section to a plurality of main reinforcement bars circumferentially of the steel reinforcement cage by welding.

[0023] According to a preferred embodiment, in step S2, before concrete pouring, adjust the position of the steel reinforcement cage such that the center point is distributed closer to one side of the ring frame beam.

[0024] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0025] (1) The present invention is used for the installation of the ring frame beam by setting the embedded parts. It is simple to process, convenient to install, and has a high utilization rate in subsequent construction. It greatly reduces the workload of welders, saves a large amount of electrode and steel bar raw material consumption, reduces construction investment, improves construction efficiency, and optimizes the overall force of the structure, reducing the safety risk of foundation pit excavation, providing new ideas and methods for the construction of embedded parts of deep foundation pit piles.

[0026] (2) The inner anchoring section of the embedded part of the present invention is used to connect the embedded part to the steel reinforcement cage. Its projection in the axial direction of the steel reinforcement cage extends along the circumference of the steel reinforcement cage. On the one hand, it can avoid interference with the inner reinforcement bars of the steel reinforcement cage during the fixation of the embedded part, facilitating the installation of the embedded part. On this basis, by further connecting the inner anchoring section to fit the main reinforcement bars, the influence of the embedded part on the internal space of the steel reinforcement cage in the horizontal direction can be reduced, thus facilitating subsequent concrete pouring of the steel reinforcement cage. On the other hand, the connection points of the inner anchoring section and the steel reinforcement cage are dispersed on a plurality of main reinforcement bars circumferentially of the steel reinforcement cage, with firm fixation. When constructing the ring frame beam, the stress points of the steel bars after the action of the embedded part are dispersed and uniform, with good safety. In addition, the embedded part is fixed not only by connecting to the main reinforcement bars but also by the concrete poured into the steel reinforcement cage, with high strength.

[0027] (3) After the outer anchoring section of the embedded part of the present invention is in contact with the outer wall of the steel reinforcement cage, it can avoid the situation of jamming the inner wall of the pile hole during the process of putting the steel reinforcement cage into the pile hole.

[0028] (4) The embedded part of the present invention has extremely strong applicability, is not restricted by other components of the steel reinforcement cage, and its size can also be adjusted according to different pile diameters and design requirements, and can be used in almost all cast-in-place pile foundation projects with embedded steel bars. Description of the Drawings

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0030] Figure 1 Front view structural schematic diagram of the shaft support in the present invention;

[0031] Figure 2 Front view structural schematic diagram of the steel reinforcement cage in the present invention;

[0032] Figure 3 Top view structural schematic diagram of the steel reinforcement cage in the present invention;

[0033] Figure 4 Three-dimensional structural schematic diagram of the embedded part provided by the present invention;

[0034] Figure 5 Front view structural schematic diagram of the installation of the embedded part provided by the present invention in cooperation with the steel reinforcement cage;

[0035] Figure 6 Top view structural schematic diagram of the installation of the embedded part provided by the present invention in cooperation with the steel reinforcement cage;

[0036] Figure 7 Three-dimensional structural schematic diagram of the installation of the embedded part provided by the present invention in cooperation with the steel reinforcement cage;

[0037] Figure 8 Three-dimensional structural schematic diagram of another form of the embedded part provided by the present invention.

[0038] Icon: 1 - Pile foundation, 11 - Steel reinforcement cage, 111 - Main reinforcement, 112 - Stirrup, 113 - Inner reinforcement, 2 - Ring frame beam, 3 - Capping beam, 41 - Outer anchorage section, 42 - Fixed connection section, 43 - Inner anchorage section, 5 - Center point, α - Right included angle, β - Left included angle. Specific embodiments

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0040] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0041] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0042] In the description of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0043] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Please refer to Figures 1 to 3 , the support structure is a row of piles formed by a plurality of pile foundations 1 arranged in parallel. To make its structure stable, a capping beam 3 connecting each pile foundation 1 is arranged at the top of the row of piles, and a plurality of ring frame beams 2 for connecting each pile foundation 1 are arranged at intervals in the vertical direction of the row of piles. The steel reinforcement cage 11 at least includes a framework composed of several main reinforcements 111 distributed circumferentially. A plurality of stirrups 112 are sleeved outside the framework and distributed at intervals along the axial direction of the main reinforcements 111, and a plurality of internal reinforcing ribs 113 are arranged at intervals along the axial direction of the main reinforcements 111 inside the framework; the plurality of stirrups 112 are evenly distributed at equal intervals, and the plurality of internal reinforcing ribs 113 are evenly distributed at equal intervals. In view of the defects of the prior art, the above problems are overcome by pre-embedding the connection components.

[0045] Please refer to Figures 4 to 7, A pre-embedded part, comprising an inner anchoring section 43, a fixed connection section 42 and an outer anchoring section 41 connected in sequence; the inner anchoring section 43 is embedded in the steel reinforcement cage 11, and the projection of the inner anchoring section 43 in the axial direction of the steel reinforcement cage 11 extends along the circumferential direction of the steel reinforcement cage 11, and the inner anchoring section 43 is connected to the inner wall of the steel reinforcement cage 11; the fixed connection section 42 penetrates through the side wall of the steel reinforcement cage 11; the outer anchoring section 41 is attached to the outer wall of the steel reinforcement cage 11. The inner anchoring section 43 here is used to connect the pre-embedded part with the steel reinforcement cage 11, and its projection in the axial direction of the steel reinforcement cage 11 extends along the circumferential direction of the steel reinforcement cage 11. On the one hand, it can avoid interference with the inner reinforcement 113 of the steel reinforcement cage 11 during the fixing process of the pre-embedded part, facilitating the installation of the pre-embedded part. On this basis, then connecting the inner anchoring section 43 to the main reinforcement 111 in a fitting manner can reduce the influence of the pre-embedded part on the internal space of the steel reinforcement cage 11 in the horizontal direction, thus facilitating the subsequent concrete pouring of the steel reinforcement cage 11; on the other hand, the connection points of the inner anchoring section 43 and the steel reinforcement cage 11 are dispersed on multiple main reinforcements 111 in the circumferential direction of the steel reinforcement cage 11, with firm fixation. When constructing the ring beam 2, the stress points of the steel bars after the action of the pre-embedded part are dispersed and uniform, with good safety. Moreover, in addition to being connected to the main reinforcement 111, the pre-embedded part is also fixed by the concrete poured in the steel reinforcement cage 11, with high strength. After the outer anchoring section 41 is attached to the outer wall of the steel reinforcement cage 11, it can avoid the situation of jamming the inner wall of the pile hole during the process of putting the steel reinforcement cage 11 into the pile hole.

[0046] During use, first, the connection between the pre-embedded part and the steel reinforcement cage 11 is realized by fixing the inner anchoring section 43 inside the steel reinforcement cage 11, then putting it together with the steel reinforcement cage 11 into the pile hole for pouring. Subsequently, during the excavation process of the shaft or foundation pit, when reaching the designed height of the ring beam 2, the outer anchoring section 41 is chiseled out from the casting for fixing the ring beam 2.

[0047] In this embodiment, the steel reinforcement cage 11 is cylindrical, and the outer shape of the inner anchoring section 43 is an arc shape extending along the circumferential direction of the steel reinforcement cage 11. Further, the arc is concentric with the steel reinforcement cage 11. During the installation process, it is convenient for the inner anchoring section 43 to fully fit with multiple main reinforcements 111 in the circumferential direction of the steel reinforcement cage 11, which is conducive to the staff welding it to the steel reinforcement cage 11. In this embodiment, the inner anchoring section 43 is connected to the main reinforcement 111 by spot welding, reducing the work intensity of the staff and being conducive to improving work efficiency.

[0048] As Figure 4 shown, the outer anchoring section 41 is attached to the outer wall of the steel reinforcement cage 11 in a manner of extending along the axial direction of the steel reinforcement cage 11. Specifically, as Figure 5As shown, preferably, the inner anchoring section 43 is in an arc shape adapted to the axial cross-section of the steel reinforcement cage 11, the fixed connection section 42 is in a cylindrical shape, the central axis of which passes through the center of the arc contour of the inner anchoring section 43, and the outer anchoring section 41 is in a cylindrical shape, the central axis of which is perpendicular to the plane where the arc contour of the inner anchoring section 43 is located. During subsequent use, the outer anchoring section 41 chiseled out from the pile foundation 1 needs to be straightened for use. In this embodiment, the inner anchoring section 43, the fixed connection section 42, and the outer anchoring section 41 of the embedded part are integrally formed and bent from steel bars.

[0049] It should be noted that the projected contour shape of the inner anchoring section 43 in the axial direction of the steel reinforcement cage 11 depends on the cross-sectional shape of the steel reinforcement cage 11 in its axial direction, so as to facilitate the fitting installation of the inner anchoring section 43 and the steel reinforcement cage 11. For example, when the cross-sectional shape of the steel reinforcement cage 11 is rectangular, the projected contour shape of the inner anchoring section 43 in the axial direction of the steel reinforcement cage 11 is all or a part of the rectangular contour.

[0050] As Figure 8 shown, in some embodiments, the shape of the inner anchoring section 43 is spiral.

[0051] This embodiment also provides a method for using the above-mentioned embedded part, including the following steps:

[0052] S1. Embedded part installation: Embed the inner anchoring section 43 in the steel reinforcement cage 11 and fix it on the inner side surface of the steel reinforcement cage 11 along the circumferential direction of the steel reinforcement cage 11.

[0053] S2. Embedded part embedding: Place the steel reinforcement cage 11 installed with the embedded part into the pile hole and conduct concrete pouring to form the pile foundation 1.

[0054] S3. Embedded part chiseling: When the foundation pit is dug to the height of the ring beam 2, break the concrete of the pile foundation 1 to fully expose the outer anchoring section 41.

[0055] S4. Embedded part straightening: Straighten the outer anchoring section 41 to a horizontal state and extend it into the inside of the ring beam 2 so that the ring beam 2 and the pile foundation 1 are connected as a whole.

[0056] Specifically, S1 includes the following steps:

[0057] A1. Mark the installation center point 5 of the embedded part on the outer wall of the steel reinforcement cage 11 according to the design position of the ring beam 2.

[0058] A2. With the center point 5 as the center on the outer wall of the steel reinforcement cage 11, draw the installation area of the embedded part around the central axis of the steel reinforcement cage 11 with a left and right angle not exceeding 45°, and the upper and lower boundary lines are preferably reduced by 10 - 15 cm from the boundary of the ring beam 2. Specifically, as Figure 6 shown, both the right included angle α and the left included angle β do not exceed 45°.

[0059] A3. Install a plurality of embedded parts on the steel reinforcement cage 11, such that the outer anchoring section 41 of the embedded part is within the installation area and is in contact with the outer wall of the steel reinforcement cage 11;

[0060] A4. Connect the inner anchoring section 43 to a plurality of main reinforcement bars 111 in the circumferential direction of the steel reinforcement cage 11 by welding.

[0061] In the above steps, the plurality of embedded parts installed on the steel reinforcement cage 11 are evenly distributed, which is mainly reflected in the even distribution of the outer anchoring sections 41 within the installation area, thereby facilitating their subsequent installation and fixation with the ring frame beam 2.

[0062] It should be noted that in step S2, before concrete pouring, adjust the position of the steel reinforcement cage 11 so that the center point 5 is distributed closer to the side of the ring frame beam 2. And during this process, after the steel reinforcement cage 11 is lowered to the design elevation, use suspension bars to fix the steel reinforcement cage 11 to prevent it from sinking and deflecting, ensuring the installation accuracy. And during concrete pouring, the speed should not be too fast to prevent the phenomenon of the steel reinforcement cage 11 floating up.

[0063] Specifically, in step S3, use a manual pneumatic pick to break the concrete of the pile foundation 1 at the position of the ring frame beam 2 to fully expose the outer anchoring section 41. During this process, water should be sprinkled in time to reduce dust and avoid environmental pollution.

[0064] In summary, the present invention uses the method of setting embedded parts for the installation of the ring frame beam 2, which is simple in processing, convenient in installation, has a high utilization rate in subsequent construction, greatly reduces the workload of welders, saves a large amount of consumption of welding rods and steel bar raw materials, reduces construction investment, improves construction efficiency, and optimizes the overall force of the structure, reducing the safety risk of foundation pit excavation, providing new ideas and methods for the construction of embedded parts of pile foundations 1 in deep foundation pits; and this embedded part has extremely strong applicability, is not restricted by other components of the steel reinforcement cage 11, and its size can also be adjusted according to different pile diameters and design requirements, and can be used in almost all pile foundation 1 projects with embedded steel bars.

[0065] In addition, the present invention also provides a processing method for the above-mentioned embedded part, including the following steps:

[0066] B1. Cut a steel bar section, mark a first point and a second point on the axial direction of the steel bar section according to a preset size, and divide the steel bar section into an inner anchoring section 43, a connection section 42 and an outer anchoring section 41 in its axial direction;

[0067] B2. Bend the inner anchoring section 43 according to the axial cross-sectional shape of the corresponding steel reinforcement cage 11 so that it can be in circumferential contact with the inner wall of the steel reinforcement cage 11;

[0068] B3. Bend the outer anchoring section 41 according to the axial cross-sectional shape of the corresponding steel reinforcement cage 11 so that it can be in contact with the outer wall of the steel reinforcement cage 11 under the condition that the inner anchoring section 43 is in circumferential contact with the inner wall of the steel reinforcement cage 11.

[0069] Furthermore, in step B2, the shape of the inner anchorage section 43 is consistent with the axial sectional shape of the steel reinforcement cage 11.

[0070] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pre-embedded part, characterized in that: it includes an inner anchoring section (43), a fixed connection section (42) and an outer anchoring section (41) connected in sequence; the inner anchoring section (43) is embedded in the steel reinforcement cage (11), the projection of the inner anchoring section (43) in the axial direction of the steel reinforcement cage (11) extends along the circumferential direction of the steel reinforcement cage (11), and the inner anchoring section (43) is connected to the inner wall of the steel reinforcement cage (11); the fixed connection section (42) penetrates through the side wall of the steel reinforcement cage (11); the outer anchoring section (41) is attached to the outer wall of the steel reinforcement cage (11); the steel reinforcement cage (11) is cylindrical, and the outer shape of the inner anchoring section (43) is in an arc shape extending along the circumferential direction of the steel reinforcement cage (11); the outer anchoring section (41) is attached to the outer wall of the steel reinforcement cage (11) in a manner extending along the axial direction of the steel reinforcement cage (11).

2. The pre-embedded part according to claim 1, characterized in that: the arc is concentric with the steel reinforcement cage (11).

3. A using method of a pre-embedded part, applied to the pre-embedded part according to any one of claims 1-2, characterized in that it includes the following steps: S1. Installation of the pre-embedded part: Embed the inner anchoring section (43) in the steel reinforcement cage (11) and fix it along the circumferential direction of the steel reinforcement cage (11) on the inner side surface of the steel reinforcement cage (11); S2. Burying of the pre-embedded part: Place the steel reinforcement cage (11) installed with the pre-embedded part into the pile hole and pour concrete to form a pile foundation (1); S3. Chiseling out of the pre-embedded part: When the foundation pit is dug to the height of the ring frame beam (2), break the concrete of the pile foundation (1) so that the outer anchoring section (41) is fully exposed; S4. Straightening of the pre-embedded part: Straighten the outer anchoring section (41) to a horizontal state.

4. The using method of the pre-embedded part according to claim 3, characterized in that: the S1 includes the following steps: A1. Mark the installation center point (5) of the pre-embedded part on the outer wall of the steel reinforcement cage (11) according to the design position of the ring frame beam (2); A2. With the center point (5) as the center on the outer wall of the steel reinforcement cage (11), delimit the installation area of the pre-embedded part not exceeding 45° left and right around the central axis of the steel reinforcement cage (11); A3. Install a plurality of the pre-embedded parts on the steel reinforcement cage (11) so that the outer anchoring section (41) of the pre-embedded part is within the installation area and is attached to the outer wall of the steel reinforcement cage (11); A4. Connect the inner anchoring section (43) with a plurality of main reinforcement bars (111) in the circumferential direction of the steel reinforcement cage (11) by welding.

5. The using method of the pre-embedded part according to claim 4, characterized in that: in the step S2, before pouring concrete, adjust the position of the steel reinforcement cage (11) so that the center point (5) is distributed close to the side of the ring frame beam (2).

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